The food that dolphins eat is different for each species.
While some dolphins eat fishes like herring, cod or mackerel, some others eat squids or other cephalopods.
Even more, large dolphins like killer whales, eat marine mammals like seals or sea lions and sometimes even turtles.
Usually, the amount of fish that they eat depends on the kind of fish that they hunt. While mackerels or herrings have a lot of fat, squids do not have much fat, therefore, to get the energy required for their activities, dolphins have to eat more of the latter.
On average, a dolphin with a weight of 200 – 250 Kg will eat between 10 Kg to 25 Kg of fish every day.
Usually, to hunt fish, some species of dolphins use a method called herding which is a cooperative hunting performed by a pod where some of them surround a school of fish to compress them as much as possible, while some others take turns to eat through the compacted school of fish.
Another method is corralling where dolphins take fish to shallow waters where they cannot escape.
Some species catch larger fish by hitting them with their tails to stun them and in the case of killer whales, they
Therefore the question about what do dolphins eat has to be answered for every species in particular.
In this video, you can watch a pod of dolphins working together to feed themselves and using the technique called herding to catch the fish as they surround the school of fish, and then some of them take turns to eat.
In the video, you can learn more about What do dolphins eat.